Black Gate: vol.1

Ordinary guy Kosaka always dreamed of having multiple girls competing for his attention. But he never imagined those fights would include swords and real physical harm! When Kosaka's girlfriend Shizuka pulls a sword on his friend Kasumi, she means serious business. Sacrificing her body to the dark presence on the other side of her school's black gate, Shizuka joins the dark side in a fight between good vs. evil.